Pauline Potter became the world's heaviest living woman last year, weighing in at a whopping 643 pounds. Now, Potter has her sights set on losing weight, and she's turned to marathon s3x sessions to help shed the pounds.

In [pic - click to view] an interview with the UK's Closer magazine, Potter described how her reignited s3x life with ex-husband Alex has helped her lose 98 pounds.

“I can’t move much in bed, but I burn 500 calories a session –- it’s great exercise just jiggling around," Potter told Closer. Potter, who had been consuming 10,000 calories a day, hopes to reach her goal weight of 532 pounds with the help of Alex. The two have s3x up to seven times each day.

She makes sure to have some fun, too.

“We love foreplay and massages and, as well as full s3x, I pleasure Alex, too," she told the magazine. "My bed is strengthened and, although I can’t buy s3xy lingerie, I drape a nice sheet over me.”

After meeting online in 2002, the couple married in 2005 and, when Potter failed to bond with Alex's son, the two split up three years later. The break-up triggered Potter's weight gain. She began consuming copious amounts of high-calorie foods and packed on the pounds.

With all the extra weight on her, Potter became depressed. She contacted the Guinness Book of World Records in hopes that winning the title of "World's Heaviest Woman" would shame her into losing weight.

When Alex got wind of the publicity surrounding Potter, he decided to visit her and the flame was quickly rekindled.

“Within the first day of being back together we had s3x six times in 24 hours," Alex told the Sun last November. “Even though one of Pauline’s legs weighs more than I do, we’re able to position her body to make s3x enjoyable for both of us."

Alex, who weighs just 140 pounds, does most of the work in the bedroom.

“It’s really dangerous for us to have s3x because at any moment the bed could collapse and one or both of us could be seriously injured or even k!lled from the impact," he told the Sun.

But using s3x for weight loss is not an unheard of activity.

"Shagging can make you slimmer, if you do enough of it," Dr. Yvonne Kristin Fulbright, a s3x educator, relationship expert, columnist and founder of s3xuality Source Inc., wrote for Fox News in 2008. "It can also help the two of you fall for each other all over again. Requiring no monthly fee — dress code optional – you can 's3xercise' yourself into shape. This is one gym membership you’ll never want to drop."

Dr. Fulbright, who has contributed to The Huffington Post and who earned her Ph.D. in International Community Health Studies at New York University, also writes that a good "s3xercise" routine can not only lead to weight loss, but also to improved blood flow, strengthening of the heart, better cholesterol, better sleep, more energy, improved muscle tone and decreased stressed.

While Potter's s3x life is speeding at full-throttle, she's also reined in her eating habits. She no longer eats 10,000 calories per day, though she still enjoys the occasional Big Mac.

At a certain point she gets so big she's just a play thing and now a human being. She's prob like a fleshlight to that man. Once she starts going back and taking the form of a real human, he'll lose interest. Right now he's at Discovery Zone.

HOW do people consume 10,000 calories a day? I know they aren't eating clean foods but we're talking about people eating large pizzas, birthday cakes, full boxes of Oreos, several 2 liters of soda and other sh*t just to hit 10,000 calories. That's some crazy sh*t to me.

These super morbidly obese people ain't happy, coming from someone who used to be morbidly obese I can tell you that sh*t will hit you in the face one day, whether by diabetes, a heart attack or just straight up shock you when you go to the doctor and weigh yourself and you get surprised by how much more you weigh than you think you did or when you sit on that grocery scooter at WalMart that goes "BEEP BEEP" when you back up

There's surgery and sh*t to take care of it for some of these people, for others they need to realize that they're gonna have to lose all this weight one day and it's better to start now than later. Thankfully it's easier to lose than put on but talking to these people is like talking to a child